Patent GB-190217611-A (GB)
Title: Improvements in Electric Clocks.
Inventor: MOBERG CARL JOSEPH
Filed: 1902-08-11
Granted: 1903-05-14
Abstract: 17,611. Moberg, C. J. Aug. 11. Framework.-One pair of pillars p<2> on the pillar plate o<2> holds out beyond the top plate, upper and lower bridges u', v<2>, in which all the arbors are wholly or partially pivoted, only the pendulum a and an electromagnet h being between the plates. Motionwork.-A centre seconds arbor y and the cannon pinion a<3> are pivoted in the two front lower bridges, and the side arbors of the corresponding motionworks are pivoted in the upper bridges. Electric clocks.-The seconds arbor is driven by the pendulum acting through ratchet gear, and having its energy replenished electromagnetically. The arrangement is as follows :-The seconds arbor runs from a ratchet-wheel w for which a lever a<1> with pawl z is provided on the first bridge v<2>, which, when free, lies in the position shown in dotted lines in Fig. 6. The free end of this lever forms a cam c<1> having a tooth b<1>, and a rock-shaft oscillating with the pendulum has an arm u from which extends a finger v resting upon the cam. With full amplitude of oscillation, the finger catches on the tooth of the cam, and pulls the lever forward, so that the ratchet-wheel is driven till the rise of the cam detaches the finger from the tooth The lever then falls back again, and the action is repeated. When, however, the amplitude of oscillation is diminished, so that the finger does not pick up the cam, it is not thereby lifted clear of a second lever e', which normally rests against a stop f<1>. This lever being consequently raised, a pin g<1> upon it bridges the gap between two strip terminals (not shown) of the circuit of an electromagnet h which attracts an armature c on the pendulum. Striking-mechanism.-Another pivoted armature j of the same electromagnet carries the hammer i for striking the gong e<2>, and is brought into action in the following way :-An arbor q<1> between the front lower bridge v<2> and the top plate bears an arm p<1> and a sleeve s<1> having a pair of arms t<1>, x<1>. The first arm bears the notched counting- wheel k<1> combined with a ratchet-wheel of the same size as the movement ratchet-wheel w, and normally rests with a notch of the counting-wheel upon a pin b<2> at the bottom of the top plate. The sleeve arms end in oblique pallets u<1>, y', the first of which is in the path of a pin v<1> on the centre wheel, and the second of which is consequently once an hour lifted into the path of a pin a<2> on the movement ratchet-wheel. As the sleeve is pinned so as to have only slight play on the arbor, the latter is sufficiently turned by the action of the pin on the ratchet-wheel to lift the striking-wheel clear of the rest-pin b<2>. A part z<1> of the ratchet pawl z accordingly drives the striking-wheel till another notch is presented to the rest-pin, and, while this is proceeding, the electric circuit is made and broken because an insulating-part c<2> of the lifting-arm p<1> holds two strip terminals up in the path of a bridge pin d<2> on a lever s which oscillates with the pendulum. Pendulums.-For allowing removal and replacement of the bob without altering the adjustment, it is made in halves h<2>, which lodge in a notch i<2> in the regulating-nut and are held together by a latch j<2>.